dynatrace-cordova-outsystems-plugin/node_modules/sshpk/lib/ed-compat.js

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

// Copyright 2015 Joyent, Inc.

module.exports = {
	Verifier: Verifier,
	Signer: Signer
};

var nacl = require('tweetnacl');
var stream = require('stream');
var util = require('util');
var assert = require('assert-plus');
var Buffer = require('safer-buffer').Buffer;
var Signature = require('./signature');

function Verifier(key, hashAlgo) {
	if (hashAlgo.toLowerCase() !== 'sha512')
		throw (new Error('ED25519 only supports the use of ' +
		    'SHA-512 hashes'));

	this.key = key;
	this.chunks = [];

	stream.Writable.call(this, {});
}
util.inherits(Verifier, stream.Writable);

Verifier.prototype._write = function (chunk, enc, cb) {
	this.chunks.push(chunk);
	cb();
};

Verifier.prototype.update = function (chunk) {
	if (typeof (chunk) === 'string')
		chunk = Buffer.from(chunk, 'binary');
	this.chunks.push(chunk);
};

Verifier.prototype.verify = function (signature, fmt) {
	var sig;
	if (Signature.isSignature(signature, [2, 0])) {
		if (signature.type !== 'ed25519')
			return (false);
		sig = signature.toBuffer('raw');

	} else if (typeof (signature) === 'string') {
		sig = Buffer.from(signature, 'base64');

	} else if (Signature.isSignature(signature, [1, 0])) {
		throw (new Error('signature was created by too old ' +
		    'a version of sshpk and cannot be verified'));
	}

	assert.buffer(sig);
	return (nacl.sign.detached.verify(
	    new Uint8Array(Buffer.concat(this.chunks)),
	    new Uint8Array(sig),
	    new Uint8Array(this.key.part.A.data)));
};

function Signer(key, hashAlgo) {
	if (hashAlgo.toLowerCase() !== 'sha512')
		throw (new Error('ED25519 only supports the use of ' +
		    'SHA-512 hashes'));

	this.key = key;
	this.chunks = [];

	stream.Writable.call(this, {});
}
util.inherits(Signer, stream.Writable);

Signer.prototype._write = function (chunk, enc, cb) {
	this.chunks.push(chunk);
	cb();
};

Signer.prototype.update = function (chunk) {
	if (typeof (chunk) === 'string')
		chunk = Buffer.from(chunk, 'binary');
	this.chunks.push(chunk);
};

Signer.prototype.sign = function () {
	var sig = nacl.sign.detached(
	    new Uint8Array(Buffer.concat(this.chunks)),
	    new Uint8Array(Buffer.concat([
		this.key.part.k.data, this.key.part.A.data])));
	var sigBuf = Buffer.from(sig);
	var sigObj = Signature.parse(sigBuf, 'ed25519', 'raw');
	sigObj.hashAlgorithm = 'sha512';
	return (sigObj);
};